Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, PR China; Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, School of Environmental Science and Engineering, Chang'an University, Xi'an 710064, PR China.
Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials (FUNSOM), Soochow University, 199 Ren'ai Road, Suzhou, 215123, Jiangsu, PR China; School of Physics, Huazhong University of Science and Technology, Wuhan 430074, PR China.
J Hazard Mater. 2018 May 5;349:111-118. doi: 10.1016/j.jhazmat.2018.01.042. Epub 2018 Feb 6.
Removal of antibiotics from aqueous solutions by photocatalysis is an advanced technology for environmental remediation. Herein, we have fabricated a series of AgX (X = I, Br)/CuBiO composites through an in-situ precipitation method. The photocatalytic activity of the obtained photocatalysts was measured by the degradation of tetracycline (TC) under visible light irradiation (λ > 420 nm). All the AgX (X = I, Br)/CuBiO composites exhibit much higher photocatalytic activity than that of pure CuBiO. The enhanced photocatalytic activity is mainly attributed to the efficient interfacial charge separation and migration in the AgX (X = I, Br)/CuBiO heterojunctions. Meanwhile, AgX (X = I, Br)/CuBiO heterojunctions display excellent photocatalytic stability, and the photocatalytic degradation rates were not obvious decreased even after five successive cycles. Based on the energy band structure, the radicals trapping and electronic spin resonance (ESR) experiments, the Z-scheme mechanism of AgBr/CuBiO and type II mechanism of AgI/CuBiO heterojunction photocatalysts were tentatively discussed, respectively.
通过光催化从水溶液中去除抗生素是一种用于环境修复的先进技术。在此，我们通过原位沉淀法制备了一系列 AgX(X=I, Br)/CuBiO 复合材料。通过可见光照射(λ>420nm)下四环素(TC)的降解来测量所得光催化剂的光催化活性。所有 AgX(X=I, Br)/CuBiO 复合材料都表现出比纯 CuBiO 更高的光催化活性。增强的光催化活性主要归因于 AgX(X=I, Br)/CuBiO 异质结中有效的界面电荷分离和迁移。同时，AgX(X=I, Br)/CuBiO 异质结表现出优异的光催化稳定性，即使经过五次连续循环，光催化降解率也没有明显下降。基于能带结构、自由基捕获和电子自旋共振(ESR)实验，分别初步讨论了 AgBr/CuBiO 的 Z 型机制和 AgI/CuBiO 异质结光催化剂的 II 型机制。
